Phylum: Charophyta   Family: Desmidiaceae

Actinotaenium diplosporum  (P. Lundell) Teiling

This species seems scarcer than the varieties. Most often found in circumneutral waters in shallow lochans and pools.

References: 
Coesel, P.F.M. & Meesters, K.J. (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands
Tsarenko, P.M., Wasser, S.P. & Nevo, E. (editors) (2014) Algae of Ukraine, Volume 4: Charophyta